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Journal of Radioanalytical and Nuclear Chemistry

, Volume 299, Issue 1, pp 407–414 | Cite as

Radioanalytical assessment of sedimentation rates in Guajará Bay (Amazon Estuary, N Brazil): a study with unsupported 210Pb and 137Cs modeling

  • Patrícia Andrade Neves
  • Paulo Alves de Lima FerreiraEmail author
  • Márcia Caruso Bícego
  • Rubens Cesar Lopes Figueira
Article

Abstract

Guajará Bay is an integral part of the Amazon Estuary system, and functions as the main receiver of urban and industrial wastes from the city of Belém, capital city of PA State (N Brazil). There is a lack of knowledge regarding quantitative measures of sedimentation, such as sedimentation rates, in the literature for this area of the Amazon Estuary. This study aimed the evaluation of recent (time range of 100 years) sedimentation rates in three sediment profiles collected in the coastal system of Guajará Bay with a radioanalytical approach of unsupported 210Pb and 137Cs modeling. The mean sedimentation rates for the cores obtained were 0.85 ± 0.12 cm year−1 for Anadim core, 1.02 ± 0.17 cm year−1 for Outeiro core and 0.53 ± 0.04 cm year−1 for Tucunduba core. With the use of three models of sedimentation rate models, it was observed that Anadim and Outeiro core presented constant sedimentation rates for the evaluated time range, but Tucunduba did not. This difference in sedimentation rates was probably due to their different sampling locations that present diverse hydrodynamic regime, with deposition of fine sediments in the upper area of the bay and stronger fluvial currents in the southernmost region.

Keywords

210Pb 137Cs Model Sedimentation rate Guajará Bay 

Notes

Acknowledgments

The authors acknowledge the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq no 146723/2010-4) that financed this work.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2013

Authors and Affiliations

  • Patrícia Andrade Neves
    • 1
  • Paulo Alves de Lima Ferreira
    • 1
    Email author
  • Márcia Caruso Bícego
    • 1
  • Rubens Cesar Lopes Figueira
    • 1
  1. 1.Instituto OceanográficoUniversidade de São Paulo (IO-USP)ButantãBrazil

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